A precision three-dimensional paper model of the church. Today only the south crossing of the large transept and some vaults are original. The model can be opened in two parts to see inside the nave. An illustrated text gives historical information and step by step instructions for assembly, in English, French, German, Spanish and Italian. There are 18 colored sheets to cut-out in order to build the model (scale 1:250, base 27.5 x 12 inches, height 7.5 inches).